If you have much money but you aren't use it, it's better to invest it than save the money. So you can earn passive income from your idle money. It's really good imo.
For me saving is the best and that is just going to be done continuous so that in the future you have enough money for your daily needs. Saving is just like investing, you are getting ready for the future expenses that you might face. So for me saving is the one that a person must do. And in bitcoin saving is also applicable and a good choice.